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Next we use population data with the counts to calculate crude rates for each of the 19 age groups. The populations must be for the same geographic area, sex, race, and years (the sum of the black female populations for 2000-2004 in the SEER 9 registries). In this step, we are calculating the crude, age-specific rates. A crude incidence rate is the number of new cancers of a specific site/type occurring in a specified population during a year, usually expressed as the number of cancers per 100,000 population at risk. It is calculated using the following formula:

c r u d e r a t e = c o u n t p o p u l a t i o n × 100 , 000

Age Count Population Crude Rate
00 years
29
 139,879 20.7
01-04 years
87
 553,189 15.7
05-09 years
67
 736,212 9.1
10-14 years
71
 770,999 9.2
15-19 years
87
 651,390 13.4
20-24 years
177
 639,159 27.7
25-29 years
290
 676,354 42.9
30-34 years
657
 736,557 89.2
35-39 years
1,072
 724,826 147.9
40-44 years
1,691
 700,200 241.5
45-49 years
2,428
 617,437 393.2
50-54 years
2,931
 516,541 567.4
55-59 years
2,881
 361,170 797.7
60-64 years
2,817
 259,440 1,085.8
65-69 years
2,817
 206,204 1,366.1
70-74 years
2,744
 172,087 1,594.5
75-79 years
2,634
 142,958 1,842.5
80-84 years
1,884
 99,654 1,890.5
85+ years
1,705
 92,692 1,839.4

Note: these values were calculated using the SEER 9 registry database from the Nov 2006 submission.

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